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O KVV Auger emission versus resonant photoemission at the O K edge of high-Tc superconductors

Nylén, H. LU ; Qvarford, M.; Chiaia, G.; Tjernberg, O.; Söderholm, S.; Zakharov, A. A. LU ; Leandersson, M. LU ; Nazin, V. G.; Tsetlin, M. B. and Lev, L., et al. (1998) In Physica C: Superconductivity and its Applications 300(3-4). p.161-170
Abstract

Photoelectron spectroscopy results on single crystals of the superconductors Bi2Sr2CaCu2O8,Bi2Sr 2CuO6, Ba0.6K0.4BiO3 and the semiconductor Ba0.9K0.1BiO3 are reported for the photon energy region around the O K absorption threshold. The development of the O-KVV Auger structure has been carefully monitored as a function of photon energy. A non-monotonic behavior displaying a feature at a constant binding energy of about 14 eV was found for Bi2Sr2CaCu2O8 and Bi2Sr2CuO6 in a narrow photon energy region of 1 eV at the main... (More)

Photoelectron spectroscopy results on single crystals of the superconductors Bi2Sr2CaCu2O8,Bi2Sr 2CuO6, Ba0.6K0.4BiO3 and the semiconductor Ba0.9K0.1BiO3 are reported for the photon energy region around the O K absorption threshold. The development of the O-KVV Auger structure has been carefully monitored as a function of photon energy. A non-monotonic behavior displaying a feature at a constant binding energy of about 14 eV was found for Bi2Sr2CaCu2O8 and Bi2Sr2CuO6 in a narrow photon energy region of 1 eV at the main edge of the O K absorption spectrum around 530 eV. The corresponding enhancement, connected with the autoionization of O 2 p states, is absent in Ba1-xKxBiO3 in contrast to Bi2Sr2CaCu2O8 and Bi2Sr2CuO6. The resonant enhancement is more pronounced for Bi2Sr2CuO6 as compared to Bi2Sr2CaCu2O8, which can be explained by a lower charge carrier concentration in the former case, leading to a more localized nature of intermediate O 2 p states. The model parameters Cu d-d and O p-p Coulomb interactions and the charge transfer energy Δ are estimated from the experiments. © 1998 Elsevier Science B.V. All rights reserved.

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Contribution to journal
publication status
published
keywords
Coulomb interactions, Cu-O planes, Electronic structure, Resonant photoemission
in
Physica C: Superconductivity and its Applications
volume
300
issue
3-4
pages
10 pages
publisher
Elsevier
external identifiers
  • Scopus:17144449234
ISSN
0921-4534
language
English
LU publication?
yes
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61d69beb-befb-432a-8ba3-85427292f5f8
date added to LUP
2016-04-27 16:50:57
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2016-07-06 13:52:39
@misc{61d69beb-befb-432a-8ba3-85427292f5f8,
  abstract     = {<p>Photoelectron spectroscopy results on single crystals of the superconductors Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8</sub>,Bi<sub>2</sub>Sr <sub>2</sub>CuO<sub>6</sub>, Ba<sub>0.6</sub>K<sub>0.4</sub>BiO<sub>3</sub> and the semiconductor Ba<sub>0.9</sub>K<sub>0.1</sub>BiO<sub>3</sub> are reported for the photon energy region around the O K absorption threshold. The development of the O-KVV Auger structure has been carefully monitored as a function of photon energy. A non-monotonic behavior displaying a feature at a constant binding energy of about 14 eV was found for Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8</sub> and Bi<sub>2</sub>Sr<sub>2</sub>CuO<sub>6</sub> in a narrow photon energy region of 1 eV at the main edge of the O K absorption spectrum around 530 eV. The corresponding enhancement, connected with the autoionization of O 2 p states, is absent in Ba<sub>1-x</sub>K<sub>x</sub>BiO<sub>3</sub> in contrast to Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8</sub> and Bi<sub>2</sub>Sr<sub>2</sub>CuO<sub>6</sub>. The resonant enhancement is more pronounced for Bi<sub>2</sub>Sr<sub>2</sub>CuO<sub>6</sub> as compared to Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8</sub>, which can be explained by a lower charge carrier concentration in the former case, leading to a more localized nature of intermediate O 2 p states. The model parameters Cu d-d and O p-p Coulomb interactions and the charge transfer energy Δ are estimated from the experiments. © 1998 Elsevier Science B.V. All rights reserved.</p>},
  author       = {Nylén, H. and Qvarford, M. and Chiaia, G. and Tjernberg, O. and Söderholm, S. and Zakharov, A. A. and Leandersson, M. and Nazin, V. G. and Tsetlin, M. B. and Lev, L. and Andersen, J. N. and Nyholm, R. and Lindau, I. and Karlsson, U. O. and Mikheeva, M. N. and Leonyuk, L.},
  issn         = {0921-4534},
  keyword      = {Coulomb interactions,Cu-O planes,Electronic structure,Resonant photoemission},
  language     = {eng},
  number       = {3-4},
  pages        = {161--170},
  publisher    = {ARRAY(0x7f8ebf0)},
  series       = {Physica C: Superconductivity and its Applications},
  title        = {O KVV Auger emission versus resonant photoemission at the O K edge of high-Tc superconductors},
  volume       = {300},
  year         = {1998},
}